Hello! I've bought a Fender Rumble 75 about 3 months ago and it sounded great really but after some loud playing (About 75% of max volume) it started to buzz at midrange notes, and its gets worse as time goes. It sounds like the disortion's on but it isn't and now its on with the lower notes too. I'm playin in a not too well cabeled place, me and 2 guitarist on the same plug but its shouldn't be a problem
Music - Fender - Rumble 75 75watt Bass Guitar Combo Amp
Answers & Comments
Try plugging another sound source into the unit. The buzz MAY be pickup of magnetic fields in your guitar pickup that clobber your notes from the strings. Bad guitar cables are another possibility. By putting clean music from say a CD player into the unit you can find where the source is. If the CD player generates the same noises, then likely you have a failure of filter caps in the amp or other component failures. Also make sure your guitar can't "hear" the amp as feedback can do strange things.